package com.it.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.it.reggie.common.BaseContext;
import com.it.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author:cyh
 * @data:2022/12/14 15:52
 */
@Slf4j
@WebFilter("/*")
public class LoginCheckFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
       //路径匹配器,支持通配符
        AntPathMatcher antPathMatcher = new AntPathMatcher();

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求:{}", requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",

                //swagger请求路径
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };

        //判断本次请求是否需要处理
        for (String url : urls) {
            boolean match = antPathMatcher.match(url, requestURI);
            //如果url和requestURI匹配上,则直接放行
            if (match) {
                log.info("本次请求{}不需要处理", requestURI);
                filterChain.doFilter(request, response);
                return;
            }
        }

        //判断是否登录,登录直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录,用户id为:{}", request.getSession().getAttribute("employee"));

            //获取HttpSession中的登录用户信息, 调用BaseContext的setCurrentId方法将当前登录用户ID存入ThreadLocal。
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(Result.filed("NOTLOGIN")));
        return;

    }
}
